"ack-ack" meaning in English

{
  "etymology_text": "From ack (“A”) + ack (“A”), RAF WWI signalese for AA (“anti-aircraft”). (In modern signalese it would be called alpha-alpha.)",
  "forms": [
    {
      "form": "ack-acks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ack-ack (countable and uncountable, plural ack-acks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "98 2",
          "kind": "other",
          "langcode": "en",
          "name": "Artillery",
          "orig": "en:Artillery",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              28,
              35
            ]
          ],
          "text": "The army fired upon us with ack-ack.",
          "type": "example"
        },
        {
          "bold_text_offsets": [
            [
              0,
              8
            ]
          ],
          "text": "Ack-acks were set up in the square.",
          "type": "example"
        },
        {
          "bold_text_offsets": [
            [
              172,
              179
            ]
          ],
          "ref": "2015, Kate Atkinson, A God in Ruins, →ISBN, page 140:",
          "text": "He had thought how down there on the ground, on enemy soil, there were probably hundreds of Ivys, nice Fräuleins with buck teeth and fiancés on U-boats, manning the German ack-ack, all united in an effort to kill him.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Antiaircraft artillery."
      ],
      "id": "en-ack-ack-en-noun-VjLP77Wo",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Antiaircraft",
          "antiaircraft#English"
        ],
        [
          "artillery",
          "artillery"
        ]
      ],
      "raw_glosses": [
        "(military slang) Antiaircraft artillery."
      ],
      "tags": [
        "countable",
        "slang",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    },
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              30,
              37
            ]
          ],
          "text": "The bomber flew through heavy ack-ack.",
          "type": "example"
        }
      ],
      "glosses": [
        "Antiaircraft fire."
      ],
      "id": "en-ack-ack-en-noun-h0c1~s~R",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Antiaircraft",
          "antiaircraft#English"
        ],
        [
          "fire",
          "fire"
        ]
      ],
      "raw_glosses": [
        "(military slang, uncountable) Antiaircraft fire."
      ],
      "tags": [
        "slang",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "synonyms": [
    {
      "_dis1": "50 50",
      "sense": "anti-aircraft gun",
      "word": "AAA"
    },
    {
      "_dis1": "50 50",
      "sense": "anti-aircraft gun",
      "word": "AA"
    }
  ],
  "word": "ack-ack"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English spelled-out initialisms",
    "English uncountable nouns",
    "Pages with 1 entry",
    "Pages with entries",
    "en:Artillery"
  ],
  "etymology_text": "From ack (“A”) + ack (“A”), RAF WWI signalese for AA (“anti-aircraft”). (In modern signalese it would be called alpha-alpha.)",
  "forms": [
    {
      "form": "ack-acks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ack-ack (countable and uncountable, plural ack-acks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English military slang",
        "English terms with quotations",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              28,
              35
            ]
          ],
          "text": "The army fired upon us with ack-ack.",
          "type": "example"
        },
        {
          "bold_text_offsets": [
            [
              0,
              8
            ]
          ],
          "text": "Ack-acks were set up in the square.",
          "type": "example"
        },
        {
          "bold_text_offsets": [
            [
              172,
              179
            ]
          ],
          "ref": "2015, Kate Atkinson, A God in Ruins, →ISBN, page 140:",
          "text": "He had thought how down there on the ground, on enemy soil, there were probably hundreds of Ivys, nice Fräuleins with buck teeth and fiancés on U-boats, manning the German ack-ack, all united in an effort to kill him.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Antiaircraft artillery."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Antiaircraft",
          "antiaircraft#English"
        ],
        [
          "artillery",
          "artillery"
        ]
      ],
      "raw_glosses": [
        "(military slang) Antiaircraft artillery."
      ],
      "tags": [
        "countable",
        "slang",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    },
    {
      "categories": [
        "English military slang",
        "English terms with usage examples",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              30,
              37
            ]
          ],
          "text": "The bomber flew through heavy ack-ack.",
          "type": "example"
        }
      ],
      "glosses": [
        "Antiaircraft fire."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Antiaircraft",
          "antiaircraft#English"
        ],
        [
          "fire",
          "fire"
        ]
      ],
      "raw_glosses": [
        "(military slang, uncountable) Antiaircraft fire."
      ],
      "tags": [
        "slang",
        "uncountable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "anti-aircraft gun",
      "word": "AAA"
    },
    {
      "sense": "anti-aircraft gun",
      "word": "AA"
    }
  ],
  "word": "ack-ack"
}